Title: Observables, fundamental physics and general relativistic effects

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Abstract:
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I will discuss the key ideas and results from some of the projects I have been involved in recently. They are:

1. Impact of halo finite size on the clustering of the HI brightness temperature
2. FFTLog and multipole decomposition of the 3PCF

Then I will go into greater detail on the following.

1. Contamination of the primordial non-Gaussianity signal by the general relativistic effects
2. Testing the equivalence principle with general relativistic effects